iweb-andy-app/timer.js

/*
setImmediate( function B() {
	console.log('7');
	setTimeout( function () {
		console.log('13');
	}, 100)
	// })
	setImmediate (function (){
		console.log('12');
	})
	process.nextTick( function() {
		console.log('10');
	})
})

process.nextTick( function C() {
	console.log('2');
	setTimeout( function () {
		console.log('5');
	}, 100)
	// })
	setImmediate (function (){
		console.log('8');
	})
	process.nextTick( function() {
		console.log('3');
	})
})

console.log('1');
*/


let i = 0;

setImmediate(function tick() {
	console.log(1);

	if (i++ < 2) {
		process.exit()
	}
	// setImmediate(tick)
	process.nextTick(tick)
})

setTimeout(() => {
	console.log(2);  // 为什么不打印
}, 0)


// save-prefix='-'


// process.nextTick()   // 不是 libuv 的东西，是node层面的 

// macrotask(宏任务)
// microtask(微任务  process.nextTick, Promise.then/catch ) 

// microtask最大长度1000